CBQE-789: systest collect query response time

Change-Id: Iec8cd722ee3e9c257f220c269afe51ba3ef7e732
Reviewed-on: http://review.couchbase.org/25040
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>